San Francisco UNIX Systems Programmer

San Francisco UNIX Systems Programmer

Post by Lee Johns » Thu, 29 Jan 1998 04:00:00

UNIX System Programmer - Back-end datastore optimization - San Francisco

Our client builds an engine that sits on Web servers and monitors activity
of visitors, then feeds this information to dynamic content servers to
display personalized pages in real-time.  Performance is paramount.

The back-end datastore (ObjectStore) has to be extremely high
performance in order to rapidly track over 10 million hits per day.  
This involves writing to the ObjectStore's native C++ interfaces.  The
datastore is written in both C (for performance) and C++ (for
interface to ObjectStore).  Performance is the key issue because they
are optimizing for high-end Web sites.  The more performance they can
squeeze out of the datastore, the more hits per day they can support.  
The datastore currently supports 10 million hits per day, but they
want to increase this dramatically.

     Performance issues include UNIX threading (the datastore has 3
     processes, 2 of which are multithreaded.  One accepts connections
     and does all the communications, and the other does the store and
     updates on the ObjectStore objects; the third watches over the
     first two to make sure they stay up.

     Experience writing compiler back-ends (code generation, code
     optimization, peephole optimization) and doing compiler
     optimization (pipelin*, instruction schedul*, code anal*, common
     subexpression elimination, branch folding, vectoriz*,
     paralleliz*, global optimiz*, induction variable analysis, flow
     analysis, data flow equat*) indicates they have faced the same
     issues that need to be addressed in the datastore's optimization.  
     The datastore does a lot of things on the system level for
     performance reasons.  They do a lot of System Calls in a certain
     way just for performance reasons.  It's not enough for the
     datastore just to be functional.  They have to do things fast.  
     Experience writing operating systems would be helpful too.

     Other preferred experience includes: C++ and/or Java, API design,
     UNIX (Solaris preferred, and multi-platform  development.

Future products will be CORBA II compliant; the current architecture
lends itself to being CORBA II compliant.  CORBA II compliance will
give the ability to open up the product to be used by third parties.  
So there will also be possibilities for API design and development.

Later, they will do a distributed datastore which will be able to
distribute the load of the recording engine across multiple machines.  
This includes machine intercommunications and making sure they are in
sync, and all the problems of distributed databases.


1. JOB - San Francisco - Unix System Administrator

CNET is seeking a  Unix Systems Administrator

Unix systems administrator
Description: the Unix systems administrator assists in the ongoing
development and maintenance of the technical infrastructure required to
host a high-volume Web site (currently 30-plus Sun Solaris computers).

Requirements: experience with Sun Solaris computers and multiprotocol
network engineering (Cisco routers, hubs, TCP/IP, and so on). Unix systems
administration skills including installation, tuning, balancing, and
capacity planning. Knowledge of mail systems, WANs, and Cisco hardware
would be a huge plus, as would experience in a Web environment. Applicants
should be team-oriented and have the ability to work in a rapidly changing

If you are interested in this position please send resume to:

CNET: The Computer Network
Attn: Sean Lally

(mail) 150 Chestnut Street, San Francisco, CA  94111
**No Attachments Please**No Phone Calls**

CNET, Inc. is an Equal Opportunity Employer

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